The lawsuit alleges that six manufacturers and two retailers that sell fish oil pills failed to warn consumers that the products contained a cancer-causing chemical…[T]esting done on behalf of the Mateel Environmental Justice Foundation in Eureka found the supplements contain PCBs, a cancer-causing chemical banned in 1979…The lawsuit names eight companies including GNC, CVS pharmacy and Rite Aid. Rite Aid and CVS declined to comment, but GNC told ABC7 that "it's confident the GNC fish oil products are safe and appropriate for use."...The companies being sued are: CVS Pharmacy, General Nutrition (GNC), Now Health Group, Omega Protein, Pharmavite, Rite Aid, Solgar and Twin Lab.